What does f-number mean?

Definitions for f-numberˈɛfˌnʌm bər

Here are all the possible meanings and translations of the word f-number.


  1. f-number(Noun)

    The ratio of the focal length of a lens to its diameter; a measure of the light-gathering ability of the lens.


  1. F-number

    In optics, the f-number of an optical system is the ratio of the lens's focal length to the diameter of the entrance pupil. It is a dimensionless number that is a quantitative measure of lens speed, and an important concept in photography.


  1. Chaldean Numerology

    The numerical value of f-number in Chaldean Numerology is: 5

  2. Pythagorean Numerology

    The numerical value of f-number in Pythagorean Numerology is: 7

Sample Sentences & Example Usage

  1. Barbara Stanwyck:

    Age is only a number.

  2. Ahmed Khalaf:

    It is no small number.

  3. William B. Snow:

    Number of Open Mics (NOM)

  4. Michael Tan:

    The real number is 65 days.

  5. Magnus MacFarlane-Barrow:

    It's a mind-boggling number.

Images & Illustrations of f-number

  1. f-numberf-numberf-number


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